Nexperia USA Inc. CBT3245AD,112

Overview

CBT3245AD,112 from Nexperia is an octal bus switch IC with eight independent single-pole single-throw (SPST) analog switches, controlled by a single active-low output enable (OE) input. It features 5 Ω typical ON resistance at 4.5 V supply, supports TTL-level control inputs tolerant up to 5.5 V, and enables partial power-down via IOFF circuitry. It is used in high-speed data path isolation for memory expansion, address/data bus multiplexing, and hot-swap I/O buffering in industrial control systems.

For engineers reviewing the CBT3245AD,112 datasheet, CBT3245AD,112 pinout, CBT3245AD,112 application, or CBT3245AD,112 equivalent, key selection criteria include ON resistance matching, IOFF-enabled power sequencing, TSSOP20 thermal performance, and -40 °C to +85 °C industrial temperature operation.

Technical Context

The CBT3245AD,112 implements a passive transmission-gate architecture with no internal level shifting or buffering-switch conduction is bidirectional and voltage-transparent between A and B ports. Its IOFF protection ensures leakage current remains below 1 μA when VCC = 0 V and input/output voltages range from -0.5 V to 7.0 V, enabling safe back-driving during partial power-down.

Dynamic behavior is characterized by sub-nanosecond propagation delay (≤0.25 ns), fast enable/disable times (1.0–6.0 ns), and low off-state capacitance (6.6 pF), making it suitable for high-frequency digital signal routing where timing integrity and capacitive loading must be minimized.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): plastic thin shrink small outline, 20-pin, 4.4 mm body width, 0.65 mm pitch, 1.1 mm max height. Pin 1 index located at top-left corner; exposed thermal pad not electrically connected unless tied to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bus switch applications.

Compared with SN74CBT3245APWRE4 and 74LVC245AT20-13, the CBT3245AD,112 uniquely combines bidirectional analog switching, sub-5 Ω RON, and IOFF-enabled safe power sequencing-making it irreplaceable in hot-pluggable industrial backplanes and mixed-voltage bus isolation.

Availability

CBT3245AD,112 is available at Aetrix Electronics and suitable for memory expansion interfaces, hot-swap I/O buffering, and microcontroller bus multiplexing requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for CBT3245AD,112 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET devices optimized for efficiency-critical applications in automotive, industrial, and consumer electronics.

The CBT3245AD,112 belongs to Nexperia's high-speed bus switch product line, engineered specifically for low-latency, low-distortion analog signal routing in industrial control and computing infrastructure where power sequencing and signal integrity are paramount.

FAQ

Can CBT3245AD,112 operate with VCC = 3.3 V?

No. The CBT3245AD,112 is specified only for 4.0–5.5 V operation per Table 5. At 3.3 V, ON resistance exceeds 15 Ω, propagation delay increases beyond 0.25 ns, and IOFF protection is not guaranteed. Use the 74LVC2G66 for 3.3 V-compatible analog switching.

Is the exposed pad on the TSSOP20 package electrically connected?

No. Per Figure 3 and Note (1) in the datasheet, the thermal pad (pin 1 index area) is not electrically connected. If soldered, it must remain floating or be tied to GND-no other connection is permitted to avoid violating the internal die isolation structure.

Does CBT3245AD,112 support 5 V tolerant OE input when VCC = 4.0 V?

Yes. Section 2 states "overvoltage tolerant control inputs to 5.5 V", and Table 4 confirms VI (input voltage) limits of -0.5 V to +7.0 V regardless of VCC. OE accepts 0–5.5 V logic levels across the full 4.0–5.5 V supply range without damage or functional degradation.

What is the maximum capacitive load the CBT3245AD,112 can drive while maintaining 0.25 ns propagation delay?

The 0.25 ns propagation delay is measured with CL = 50 pF (Table 9). Exceeding this load increases RC delay linearly; at 100 pF, tpd rises to ~0.5 ns. For loads >50 pF, verify timing margins using the 5 Ω RON and actual trace capacitance in the target layout.